Hand-operated car-brake.



L. W. HORNE & W. N. CRANEv HAND OPERATED CAR BRAKE. APPLICATION FILEDJAN-12,1914.

Patented Dec. 28, 1915.

WITNESSES.

J jam Y A TTOH/VE) *UNTTED STATES LAWRENCE W. HORNE AND WARREN NOBLECRANE, OF NEW YORK, N. Y., ASSIGNORS TO LORD MANUFACTURING (10., OFBROOKLYN, NEW YORK, A CORPORATION OF NEXKT YORK.

HAND-OPERATED OAR-BRAKE.

Specification of Letters Patent.

Patented Dec. 28, 1915.

To all whom it may concern:

Be it known that we, LAWRENCE WESLEY HORNE, a citizen of the UnitedStates, and resident of the borough of Brooklyn, county of Kings, cityand State of New York, and

' WARREN NOBLE CRANE, a citizen of the United States, andresident of theborough and county of Bronx, city and State of New York, have inventedcertain new and useful Improvements in Hand Operated Car- Brakes, ofwhich the following is a specification.

The device, the subject of this invention is intended as an improvementin the construction of a type of brake that has come into use as aresult of a desire to place all of the controlling devices of a car intoa restricted space. This brake is of the type sometimes called no-staff'brakes for the reason that the staff or rod vertically arranged and tothe top of which the hand wheels is usually secured is omitted. Ahousing being substituted for supporting the hand wheel and forinclosing certain draw chains or cables and other mechanisms which servein combination to operate the brake proper.

In our invention we have Produced a means for obtaining a differentialtransmission for operating a chain, this differential imparting a drawupon the brake of the required speed and of a desirable force.

Other improvements and the advantages of the construction will be notedas the specification progresses.

The following is what we consider the best means of carrying out thisinvention.

The accompanying drawings form a part of this specification, in whichFigure 1 is a front elevation of the housing and wheel and sheaves, thechain is shown in dotted lines. F 2 is a side elevation partly insection of the parts showing our improvements.

Similar reference numerals indicate like parts in all the figures wherethey appear.

In setting forth our invention we have shown certain elements that arewell known and that will require no description. These elements ormembers are principally the hand wheel 1, the brake draw bar 2, and theplatform or car floor shown at 3, all of which are arranged in acustomary and conventional position.

A housing 4: secured at a convenient place upon the platform is providedwith a removable cap 5, which together with the upper end of the housingaccommodates two alined bearings 6 and 7 and in these bearings androtatable therein we arrange a shaft 8 upon a protruding end of whichthe hand wheel 1 is secured. Upon this shaft 8 is also secured twosheaves of different diameters as shown at 9 and 10, and although wehave secured each of these sheaves to the shaft it is obvious that oneof the sheaves may be secured by being keyed to the shaft and the othersheave may be secured by being bolted to the keyed sheave, thisconstruction will allow the ratio of the sheaves to be changed by aquick substitution for the bolted sheaves of one of a different size.

Passing over the sheaves 9 and 10 we have arranged a continuous chainhaving a downwardly depending loop 11 and two additional downwardextending ends 12 and 13. The chain passes around the larger sheave 10through the loop 11 around the smaller sheave 9 and then on downward,through a suitable hole 14 in the platform of the car.

Arranged upon the under side of the platform we provide suitablebrackets 15 and 16 which serve to support a strong shaft or pin 17 andupon this shaft we arrange two sheaves 18 and 19 of about the samediameter, these sheaves are free to turn independently upon the pin 17and one of the sheaves 19 has the face over which the chain passes freeand unobstructed, while the chain face or race of the other sheave isprovided with pockets 20 into which the links of the chain will engagewhile passing.

Formed integral with the sheave 18 or reliably secured thereto we havearranged a ratchet 21 and secured in the bracket 16 and immediately overthe ratchet 21 we provide a dog 22 which is pivoted at 23 and isoperated by a foot plunger 24, which extends up ward to the upper faceof the platform 3. This foot plunger 24: is also pivoted to the dog orpawl 22 as shown at 25, and the perforation or hole in the platformthrough which the plunger 24 passes is of a size suiiicient to allow afree unrestricted motion to be transmitted from the foot of the operatorto the dog or pawl. The combination of the dog and ratchet with thesheave 18 serves to Y hold the chain in any position to which it -may.be drawn, in a manner that is readily understood.

It will be seen that because of the difference in the diameters of thesheaves 9 and 10 both of which are rotated upon the same shaft that adifierential action is obtained, the sheave 10 serving to take up thechain more rapidly than the sheave 9 can pay it out Withthe result thatthe loop 11 will continually increase in length and the applied forcewill be in a direct ratio to the ratios of the diameters of the sheaves9 and 10. After passing over the sheaves 1S and 19 the chain almostcompletely encircles a suitable Wheel 26 arranged in the end of thebrake draw bar or pull rod 2 and supported upon a pin therein, and uponwhich pin the wheel 26 is free to turn. The chain is then joined or itmay be completed before being placed in position, at any rate the chainis endless and the wheel 26 is received in what may be considered thelower'loopof the chain. The upper loop is shown at 11 and it will beunderstood that the slack occasioned by the take up of the chain insetting the brakes will lengthen thisloop 11 we have however providedwhat we will term an adjustable slack-limit rod or bolt 28 which passesthrough the housing 4 and which also passes through the loop 11 of thechain. \Ve have provided a plurality of holes 29 and 30 into any ofwhich the bar or bolt 28 may be secured and when the brake is slackenedoff the chain will be free to run out until the loop 11 engages the bar28. Care is taken however that this engagement of the loop 11 upon thebar 28 will not occur until the brake shoe has been efiiciently freed,but this adjustable bar adds the advantages that it will never benecessary to take up a great quantity of slack before the brake becomesoperative and in further limiting the useless number of revolutions ofthe hand Wheel 1.

Modifications may be made within the scope of the appended claimswithout departing'fromthe principle or sacrificing the advantages ofthis invention but we prefer the whole as shown.

Having carefully and fully described our invention what we claim anddesire to secure by Letters Patent is:

1. Means for operating a car brake comprising a hand wheel, sheaves ofdifferent diameters secured to and rotated by said hand wheel and acontinuous chain passing over both of said sheaves and forming a freeloop between them and a pulley secured to said brake for receiving saidchain.

1-. Means for operating a car brake comprising a hand wheel, pluralityof sheaves of different diameters in axial alinement with said handwheel a shaft secured in said hand wheel and said sheaves, a draw barfor said brakes and having a pulley secured in its end and a continuouschain moved by said hand wheel and passing over said sheaves and overthe pulley in said draw bar as herein specified.

3. Means for operating a car brake or analogous device, a chain adifferential sheave device for traversing said chain a plurality ofadditional sheaves over which said chain is adapted to pass, means forconnecting said chain to a brake, and means for preventing a reversedrotation of one of said additional sheaves as and for the purpose setforth.

1. Means for operating a car brake or analogous device consisting of aplurality of sheaves, means for rotating them, a flexible member passingover said sheaves and producing a loop therein, means for connectingsaid flexible member to a brake and means for positively limiting theminimum length of said loop as and for the purpose set forth.

5. A car brake or analogous device having a housing a shaft rotatable insaid housing, a means exterior to said housing for imparting motion tosaid shaft, a plurality of sheaves of different diameters within saidhousing and secured to said shaft, a chain passing over and traversed bysaid sheaves and arranged within said housing, means for connecting saidchain to a brake, a second set of sheaves of uniform diameter arrangedbetween said diflerential and said brake one of said sheaves beingprovided with a ratchet, a dog arranged adjacent thereto and adapted tocooperate therewith to retain a tension upon said chain and anadjustable bar arranged in said housing for limiting the slack of saidchain upon the release of said brakes as herein specified.

Signed at New York city,"in'the county of New York and State of New Yorkthis 10th day of January, 1914.

LAlVRENCE 1V. HORNE. VARREN NOBLE CRANE. lVitnesses:

ROYAL V. MACKEY, ARTHUR PHELPS MARK.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

